CI: Fix concurrency group for new CoW warn build (#55770)

* CI: Fix concurrency group for new CoW warn build

* Formatting

Author: mroeschke

.github/workflows/unit-tests.yml

@@ -69,7 +69,7 @@ jobs:
             env_file: actions-311.yaml
             pattern: "not slow and not network and not single_cpu"
             pandas_copy_on_write: "1"
-          - name: "Copy-on-Write (warnings)"
+          - name: "Copy-on-Write 3.11 (warnings)"
             env_file: actions-311.yaml
             pattern: "not slow and not network and not single_cpu"
             pandas_copy_on_write: "warn"
@@ -98,7 +98,7 @@ jobs:
       PYTEST_TARGET: ${{ matrix.pytest_target || 'pandas' }}
     concurrency:
       # https://github.community/t/concurrecy-not-work-for-push/183068/7
-      group: ${{ github.event_name == 'push' && github.run_number || github.ref }}-${{ matrix.env_file }}-${{ matrix.pattern }}-${{ matrix.extra_apt || '' }}
+      group: ${{ github.event_name == 'push' && github.run_number || github.ref }}-${{ matrix.env_file }}-${{ matrix.pattern }}-${{ matrix.extra_apt || '' }}-${{ matrix.pandas_copy_on_write || '' }}
       cancel-in-progress: true
 
     services: